PROBLEM TO BE SOLVED: To lower the loss rate of cells, to maintain and improve the quality of service and to reduce congestion of a transmission line by compressing and restoring data in an ATM layer in an ATM network. ;SOLUTION: An ATM cell restoration device 2, provided with a compressed cell judgement part for deciding whether or not an ATM cell inputted through the transmission line is a compressed cell and a cell restoration part for executing a restoration processing in the ATM layer for the ATM cell and restoring it to an original ATM cell at deciding that the ATM cell is the compressed cell, a switch device 3 for executing a switching processing for the restored ATM cell and a ATM cell compression device 4 provided with a compression object cell decision part for deciding whether or not the ATM cell outputted from the switch device to the same route is a compression object cell and a compressed cell preparation part for executing a compression processing in the ATM layer for the ATM cell and preparing the compressed cell at deciding that the ATM cell is the compression object cell are provided.;COPYRIGHT: (C)2000,JPO
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